Tokyo High School

The relationship betWeen technoiogy and

Two biological types of Japanese dark chub, so-called types A and B of Zacco temminckii, were taxonomically inspected. A comparison of types A and B with the lectotypes of Leuciscus sieboldii and L. temminckii in Siebold's collection revealed that type A is identical to L. sieboldii, whereas type B matches L. temminckii. Hence, Zacco sieboldii and Z. temminckii were redescribed on the basis of the lectotype and additional specimens from Japan. Zacco sieboldii is distinguishable from Z. temminckii by having a narrower band on the anterior portion of both body sides, nine branched rays of anal fin (10 in Z. temminckii), lateral line scales not less than 53 (not more than 52 in Z. temminckii), and scales above lateral line not less than 13 (not more than 11 in Z. temmincki). A key to the species of Japanese Zacco is also provided.

To exaine the earthquake resistance behavior of lattice frame-light weight concrete wall panels, nine panel specimens of different forms were tested under axial and reversal horizontal loading. Initiation of cracks, degradation of rigidity and failure mode were observed. In this paper, load bearing capacity and deformation of panels are compared with those of reinforced concrete frame, and those of brick masonry. Simple analysis of direct stiffness method which predict the stiffness and strength of specimens under axial loading and shear loading are applied to these test specimens. Based on the test results and theoretical analysis, practical formulae are proposed to provide a reliable basis for design. Test results show that the latticed frame and light weight concrete wall panels have good the earthquake resistance behavior.

The karyotype of a lungless salamander,Onychodactylus fischeri, from Korea was analyzed and compared with that of the Japanese congeneric species,O. japonicus. In both species the diploid karyotype consists of78 chromosomes, including 6 pairs of large chromosomes, 6 pairs of medium-sized ones, and the remaining 27 pairs of microchromosomes. The chromosome number ofO. fischeri, 2n=78, is, like that ofO. japonicus, the largest so far reported in the order Urodela. C-banding showed that constitutive heterochromatin inO. fischeri was mainly in the centromeric regions and near the secondary constrictions of the large chromosomes. AgNO3-bands were located in the secondary constrictions associated with C-band heterochromatin.